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dc.contributor.advisorChandrasekhara, M. S.
dc.contributor.authorGonz‡lez, Edgar E.
dc.date16-Jun
dc.date.accessioned2016-08-02T19:35:01Z
dc.date.available2016-08-02T19:35:01Z
dc.date.issued2016-06
dc.identifier.urihttps://hdl.handle.net/10945/49468
dc.description.abstractThe flow features developing over a two-element NACA 0012 airfoil, with the rear portion serving as a trailing edge flap, were investigated using dye flow visualization in the NPS water tunnel. The original motivation for the work arose from a need to identify any potential to enhance maneuverability of aircraft to enable smoother landing under adverse flight situations. The flap portion was maneuvered in two different unsteady motion histories by a drive mechanism: a constant pitch rate motion and a sinusoidal oscillatory motion, at Reynolds numbers of 7,500 and 37,500. Comparisons were also drawn with steady flow features under similar conditions. In both unsteady cases, features of dynamic stall flow were observed. Unlike standard airfoil dynamic stall, the unsteady flow over a dynamic flap develops in the wake of the airfoil main element. This introduces many flow complexities such as reversed flows at low flap (deflection) angles of attack, dynamic stall developing from the wrap-around trailing edge flow that also interacts with main element boundary layer flow, unusual behavior for the main element, and flap clearance gap flow. However, since dynamic stall was observed at such flap deflections, it indicates that by differentially oscillating the flaps, it might be possible to develop differential lift on the two sides of a flight vehicle, which may provide better control authority than seen in steady flows. The results could be applied to unmanned air vehicles as well.en_US
dc.description.urihttp://archive.org/details/watertunnelstudi1094549468
dc.publisherMonterey, California: Naval Postgraduate Schoolen_US
dc.rightsCopyright is reserved by the copyright owner.en_US
dc.titleWater tunnel studies of dynamic wing flap effectsen_US
dc.typeThesisen_US
dc.contributor.secondreaderJones, Kevin D.
dc.contributor.departmentMechanical and Aerospace Engineeringen_US
dc.contributor.departmentMechanical and Aerospace Engineering (MAE)
dc.subject.authorunsteady aerodynamicsen_US
dc.subject.authoroscillatory flapen_US
dc.subject.author2D-unsteady flowsen_US
dc.description.serviceLieutenant Commander, Mexican Navyen_US
etd.thesisdegree.nameMaster of Science in Mechanical Engineeringen_US
etd.thesisdegree.levelMastersen_US
etd.thesisdegree.disciplineMechanical Engineeringen_US
etd.thesisdegree.grantorNaval Postgraduate Schoolen_US
dc.description.distributionstatementApproved for public release; distribution is unlimited.


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